Biology 9700 · AS & A Level · Homeostasis in mammals

Homeostasis in mammals — practice question

Fig. 1.1 shows a diagram of a kidney nephron and some of its blood vessels.
(a)[4]

Using Fig. 1.1, complete Table 1.1 with letters A-G. Each letter may be used once, more than once or not at all. The table asks for identification of: efferent blood vessel; part of nephron containing cells that respond to ADH; part of nephron where podocyte cells are located; part of nephron containing cells located in the medulla.

(b)[5]

Describe and explain how the cells of the proximal convoluted tubule are adapted for selective reabsorption.

(c(i))[2]

Fig. 1.2 shows the concentration of ADH in the blood at different percentage changes in water potential of the blood. Describe the trend shown in Fig. 1.2.

(c(ii))[1]

A person may sometimes have a low concentration of ADH in the blood even when there is a change in water potential. Suggest one effect on the circulatory system of a low concentration of ADH in the blood.

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: Correct letter for the efferent blood vessel

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